bolometer

bolometer
bolometric /boh'leuh me"trik/, adj.bolometrically, adv.
/boh lom"i teuhr, beuh-/, n. Physics.
a device for measuring minute amounts of radiant energy by determining the changes of resistance in an electric conductor caused by changes in its temperature.
[1880-85; < Gk bol(é) ray + -o- + -METER]

* * *

▪ measurement instrument
      instrument for measuring radiation by means of the rise in temperature of a blackened metal strip in one of the arms of a resistance bridge. In the first bolometer, invented by the American scientist Samuel P. Langley (Langley, Samuel Pierpont) in 1880, a Wheatstone bridge was used along with a galvanometer that produced a deflection proportional to the intensity of radiation for small deflections. A later bolometer consists of four platinum gratings (each of which is made of a series of strips) inserted in the arms of a resistance bridge; two of these gratings, in opposite arms of the bridge, are placed one behind another, so that the openings of one are opposite the strips of the other and are exposed to the radiation, the other opposite pair being shielded; this arrangement doubles the effect on the galvanometer and also compensates for any extraneous temperature changes. Changes in temperature as small as 0.0001° C may be detected in this way.

      The spectrum bolometer consists of a single strip set on edge, in an arm of a bridge. It is used for exploring the distribution of intensity of radiation in a spectrum.

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Bolometer — Bo*lom e*ter, n. [Gr. ? a stroke, ray + meter.] (Physics) An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; called also {actinic balance}, {thermic balance}. S. P. Langley. [1913… …   The Collaborative International Dictionary of English

  • Bolomēter — (griech., »Strahlungsmesser«), von Svanberg 1851 erfundenes und von Langley 1883 verbessertes Instrument, das weit empfindlicher ist als die Thermosäule, besteht aus einer Wheatstoneschen Brücke (s. Elektrotechnische Meßinstrumente), in deren… …   Meyers Großes Konversations-Lexikon

  • Bolometer — (Strahlungsmesser). In die beiden Zweige einer Wheatstoneschen Brücke sind seine Streifen von Platin, Stahl oder Palladiumblech eingeschaltet; die geringste Erwärmung des einen Streifens hat einen Galvanometerausschlag zur Folge. Die… …   Lexikon der gesamten Technik

  • Bolometer — Bolomēter (grch., »Strahlungsmesser«), 1857 von Svanberg vorgeschlagenes, 1881 von Langley ausgeführtes Instrument zum Messen äußerst geringer Temperaturunterschiede (bis 0,1° C.), beruht auf dem Gesetz, daß der elektr. Leitungswiderstand von… …   Kleines Konversations-Lexikon

  • bolometer — ☆ bolometer [bō läm′ət ər ] n. [< Gr bolē, ray, lit., something thrown < ballein, to throw (see BALL2) + METER] Physics a very sensitive instrument for measuring and recording the intensity of small amounts of radiant energy bolometric… …   English World dictionary

  • Bolometer — A bolometer is a device for measuring the energy of incident electromagnetic radiation. It was invented in 1878 by the American astronomer Samuel Pierpont Langley.It consists of an absorber connected to a heat sink (area of constant temperature)… …   Wikipedia

  • Bolometer — Ein Bolometer, auch bolometrischer Detektor (griechisch bole „Wurf“, „Strahl“), ist ein Strahlungssensor, der in Form von elektromagnetischer Strahlung die abgestrahlte Energie im gesamten Wellenlängenspektrum detektiert, meist über die… …   Deutsch Wikipedia

  • Bolometer — Bo|lo|me|ter 〈n. 13〉 Gerät zum Messen von Strahlungsenergie [<grch. bole „Wurf, Strahl“ + metron „Maß“] * * * Bolometer   [zu griechisch bole̅ »Wurf«, »(Sonnen )Strahl«] das, s/ ,    1) Hochfrequenztechnik: Barretter.    2) Optik: Gerät zum… …   Universal-Lexikon

  • Bolometer — bolometras statusas T sritis Standartizacija ir metrologija apibrėžtis Labai jautrus termometrinis įtaisas, naudojamas spinduliuotei aptikti ir jos energijai matuoti. Jo svarbiausias elementas – trumpa ir siaura visiškai juoda šilumą sugeriančia… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • bolometer — bolometras statusas T sritis Standartizacija ir metrologija apibrėžtis Labai jautrus termometrinis įtaisas, naudojamas spinduliuotei aptikti ir jos energijai matuoti. Jo svarbiausias elementas – trumpa ir siaura visiškai juoda šilumą sugeriančia… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”